Answer:
Gravity is never equal to zero because the force of gravity will always exist, but could just be really small. In other words it depend on the weight of gravity but it will never equal zero.
Explanation:
Answer:
All cells have a nucleus, which acts like the brain of the cell
Explanation:
prokaryotic cells don't have a nucleus
Answer:
R/ Protects sperm antigens from exposure to the cells of the immune system.
Explanation:
In mammals there is a barrier (blood-testis barrier) within the seminiferous tubes formed by tight junctions between Sertoli cells that separates spermatogonias from primary spermatocytes. This barrier separates the seminiferous tube into two compartments, the basal and the adluminal. The basal compartment between the basement membrane and the tight junctions can be accessed by elements of the plasma and immune cells, while the second compartment is not.
I belive it would be respiration
Because respiration occurs in animals and plants after the intake of food or oxygen. A series of reaction occur with oxygen to convert glucose(sugar) into carbon dioxide,water, and energy.
Hope this helps some :)
The answer is "populations." It changed throught the gene pool of populations. Hope that helps.
~Deceptiøn